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प्रश्न
The K and L shells of the elements Na and Mg contain electrons.
पर्याय
Right
Wrong
उत्तर
The K and L shells of the elements Na and Mg contain electrons- Right
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संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
What is periodicity in properties of elements with reference to the Modern Periodic Table?
State modern periodic law.
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:
(a) P
(b) Q
(c) R
(d) S
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same period of the periodic table?
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
Explain why All the elements of a group have similar chemical properties.
What are the merits of the modern periodic table of elements?
In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
How many groups and periods does the modern periodic table have?
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in halogens.
What is the main characteristic of the last element in each period of the periodic table?
How will the tendency to gain electrons change as we go from left to right across a period? Why?
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Name an element of group 18 which can form compounds.
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Bisulphite
Give the symbol and valency of the following element and radical.
Hydroxide
State what is meant by the term chemical formula.
Give the chemical formula of carbonic acid
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
To the left of the zig-zag line in the periodic table are the metal elements.
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
Distinguish between:
Group 17 - Group 18
What are groups and periods in the modern periodic table?
State any five features of modern periodic table.
______ and ______ are called inner transition elements.
The longest period of the Modern Periodic Table is period.
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
Spot the error:
The elements of group 13 are called the carbon family.
State the group and period, of the element having three shells with three electrons in valence shell.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
